Vessels Clotting (video) University of Washington Loading video... Caption This video shows blood pumping through an engineered microvessel stimulated with an agent that causes inflammation. Over time green clots form in the vessel, like they do in the human body. Credit Y. Zheng, U. of Washington Usage Restrictions With credit Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.